JPH0439474Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a hydraulic shock absorber that is suitably used to dampen vehicle vibrations, and in particular, the present invention relates to a hydraulic shock absorber that is suitably used to dampen vibrations of a vehicle. This invention relates to a hydraulic shock absorber that can be fixed to.

[Prior art]

Conventionally, as a hydraulic shock absorber with a bump rubber, for example, as shown in Japanese Utility Model Application No. 60-71746,
The cylinder is provided with a bump stopper on the protruding end side of the piston rod, and the bump stopper consists of a stopper against which the bump rubber comes into contact, and a cap, which is a covered cylindrical body welded to the stopper and is press-fitted directly into the cylinder. The cap consists of a flat part to which the stopper is welded and a side part to which the cylinder is fitted.The flat part has fan-shaped grooves formed alternately in an uneven shape, and the side part has ventilation holes that communicate with one of the fan-shaped grooves. A groove is formed and a mounting portion press-fitted into the cylinder is formed.

In the conventional bump stopper configured as described above, when the bump rubber comes into contact with the bump rubber, air is ejected as a jet from one fan-shaped groove, and air is ejected through the other fan-shaped groove and the ventilation groove.

[Problem that the invention attempts to solve]

However, in the prior art described above, the cap is directly fitted to the cylinder.
As a mechanism for preventing the cap from coming off, a press-fitting mounting portion is simply formed on the side surface. For this reason, the cap is repeatedly subjected to axial impacts by the bump rubber, which causes a problem in that the mounting portion of the side surface gradually expands in diameter, weakening the fitting force, and causing the cap to come off.

The present invention was developed in view of the above-mentioned shortcomings of the prior art.The present invention enables the bump rubber receiver etc. to be easily fixed to the upper side of the packing cap during the final assembly process after the painting process. It is an object of the present invention to provide a hydraulic shock absorber that can reliably prevent the shock absorber from accidentally falling off.

[Means for solving problems]

The configuration adopted by the present invention in order to solve the above-mentioned problems includes a shock absorber main body, a packing cap that covers the upper end side of the shock absorber main body, and an integrated side that is connected to the outside of the shock absorber main body through the packing cap. A hydraulic shock absorber comprising a piston rod protruding from the top and a bump rubber provided on the protruding end side of the piston rod, which is fixed to a packing cap so as to surround the piston rod, and has an exhaust hole formed in the radial direction. a cylindrical member; a bump rubber receiver that receives the bump rubber when the piston rod is at its maximum contraction; Fitted on the outer circumferential side of the member,
The cap member is characterized in that a portion of the lower end thereof is bent inward in the radial direction and serves as a locking portion that locks into the exhaust hole of the cylindrical member.

[Effect]

With this configuration, the cap member is fitted to the outer periphery of the cylindrical member, the locking portion of the cap member is bent radially inward with respect to the exhaust hole of the cylindrical member, and the locking portion is opened to exhaust air. By locking into the hole, the cap can be fixed to the cylindrical member.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 4.

In the figure, 1 is an outer cylinder constituting the shock absorber main body, and an inner cylinder (not shown) is disposed coaxially within the outer cylinder 1.
A piston (not shown) is slidably inserted into the inner cylinder. Reference numeral 3 indicates a packing cap that covers the upper end of the outer cylinder 1. The packing cap 3 is formed in the shape of a stepped cylinder with a lid, and its lower end is fixed to the upper end of the outer cylinder 1 by means such as welding. ing. Reference numeral 5 indicates a piston rod whose one end protrudes outside the outer cylinder 1 through the packing cap 3, and the other end of the piston rod 5 is fixed to the piston within the inner cylinder.

Next, reference numeral 11 indicates a bump rubber provided on the protruding end side of the piston rod 5;
1 is formed into a cylindrical shape from an elastic material such as rubber,
An annular gap 12 is formed between the inner circumferential side and the outer circumferential surface of the piston rod 5. The bump rubber 11 collides with a bump plate 14, which will be described later, when the piston rod 5 is at its maximum contraction and is elastically deformed to absorb the impact at this time.

Reference numeral 13 indicates a cylindrical member fixed to the packing cap 3 so as to surround the periphery of the piston rod 5, and the lower end side of the cylindrical member 13 has a plurality of members arranged at intervals in the circumferential direction as shown in FIG. protrusion 13A,
13A, . . . are formed in a protruding manner, and the cylindrical member 13 is integrated with the packing cap 3 by resistance welding each protrusion 13A to the outer circumferential side of the packing cap 3. Further, the axially intermediate portion of the cylindrical member 13 is provided with a predetermined interval in the circumferential direction, for example, 3
Exhaust holes 13B, 13B, .

Each exhaust hole 13B is connected to the bump rubber 11.
When the bump plate 14 collides with the bump plate 14, the air in the gap 12 is compressed, and in order to prevent it from entering the packing cap 3 from between the packing cap 3 and the piston rod 5 together with the surrounding dust, etc., this air and Dust and the like are discharged from the inside of the cylindrical member 13 toward the outside, and at the same time, the packing cap 3 and the like are provided with a cooling effect by air flow. Here, the cylindrical member 13 is made by pressing a metal plate of a predetermined thickness to form each protrusion 13A and each exhaust hole 13B, and then abutting both ends of the metal plate as shown in FIG. It is rolled into a cylindrical shape. In this case, the seams 13C at both ends of the metal plate do not need to be fixed by means such as welding.

Reference numeral 14 denotes a bump plate as a bump rubber receiver for receiving the bump rubber 11. The bump plate 14 is formed into a disk shape from a metal plate having a predetermined thickness, and a rod insertion hole 14A is bored in the center thereof. It is set up. Reference numeral 15 designates a cap member in the form of a closed cylinder that fixes the bump plate 14 to the cylindrical member 13. The cap member 15 has a rod insertion hole 15A in the center as shown in FIG. A disc-shaped lid portion 15B is fixed to the lower surface by means such as welding, and a cylindrical portion 15C extends downward from the outer peripheral end of the lid portion 15B and is fitted to the outer peripheral surface of the cylindrical member 13. and the cylindrical portion 15C
With a predetermined interval in the circumferential direction on the lower end side of the
It consists of locking parts 15E, 15E, .
Each locking portion 15E is connected to each exhaust hole 13 of the cylindrical member 13.
The exhaust hole 13B is crimped by crimping means or the like so as to be bent radially inward, and is latched to the upper end of each exhaust hole 13B. (See Figure 1).

The hydraulic shock absorber according to this embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, the cylindrical member 13 in which each exhaust hole 13B is bored in the radial direction is connected to each protrusion 13 on the lower end side.
The cylindrical portion 15C of the cap member 15 is fixed in advance to the packing cap 3 by welding or the like via the bump plate 14, and then the cylindrical portion 15C of the cap member 15 is fixed to the lower surface of the bump plate 14.
3, and the cylindrical portion 15C.
Each locking portion 15E formed through the slits 15D, 15D on the lower end side is bent radially inward toward each exhaust hole 13B of the cylindrical member 13, and is latched to the upper end of each exhaust hole 13B. Because I did it like this,
For example, in the final assembly process after the painting process, etc., the cap member 15 is attached to the bump plate 14.
In addition, it can be easily fixed to the cylindrical member 13 and prevents problems such as the bump plate 14 falling out from the cylindrical member 13 together with the cap member 15 due to vibrations, shocks, or improper handling during transportation of the hydraulic shock absorber. It can definitely be resolved.

When each locking part 15E of the cap member 15 is crimped into each exhaust hole 13B of the cylindrical member 13, each locking part 15E is aligned and crimped while visually checking each exhaust hole 13B from the outside in the radial direction. This allows the caulking work to be performed easily and improves work efficiency. In addition, when the bump rubber 11 collides with the bump plate 14 and is elastically deformed when the piston rod 5 is contracted, air, etc. in the gap 12 and the cylindrical member 13 are removed together with dust from each exhaust hole 13B.
The air can be discharged to the outside through the air flow, and the air flow at this time can provide a cooling effect to the packing cap 3 and the like.

Further, the cylindrical member 13 is formed by press-molding each protrusion 13A, each exhaust hole 13B, etc. on a single metal plate, and then
Since the metal plate can be formed simply by roll-forming it into a cylindrical shape by butting both ends thereof, it has various effects such as fewer pressing steps, simplified molding, and can be manufactured at low cost.

Next, FIG. 4 shows a second embodiment of the present invention,
The feature of this embodiment is that exhaust holes 21B, 21B,
...is cut out into a substantially U-shape and formed in the radial direction.

Here, on the lower end side of the cylindrical member 21, a plurality of protrusions 21 are located on both circumferential sides of each exhaust hole 21B.
A, 21A, ... are provided to protrude downward, and each protrusion 2
1A is fixed to the packing cap 3 using means such as resistance welding. Further, each exhaust hole 21B is formed, for example, three, with a predetermined interval in the circumferential direction of the cylindrical member 21, and each exhaust hole 21B
Each of the locking portions 15E of the cap member 15 described in the first embodiment is secured to the upper end of the cap member 15 by caulking means. Then, the cylindrical member 21
Almost similarly to the cylindrical member 13 described in the first embodiment, each protrusion 21A and each exhaust hole 21B are press-formed on a metal plate of a predetermined thickness, and then both ends of this metal plate are butted together. It is formed by roll forming into a cylindrical shape, and the seams 21C between both ends are abutted against each other without welding.

Thus, in this embodiment configured in this way, it is possible to obtain almost the same effects as in the first embodiment, but in particular, in this embodiment, not only can the area of each exhaust hole 21B be expanded; , each protrusion 21A and each exhaust hole 21B can be formed continuously without being separated from each other, and the shape of the press molding die can be simplified, and various other effects can be achieved.

In each of the above embodiments, each locking portion 15E is formed on the lower end side of the cylindrical portion 15C of the cap member 15 through the slits 15D, 15D, but each slit 15D and each locking portion 15E are It is not necessary to provide each exhaust hole 1 of the cylindrical member 13, 21 by caulking the lower end side of the cylindrical portion 15C.
3B, 21B may be crimped, and in this case, the strength of the cap member 15 can be increased. Alternatively, for example, three locking portions may be provided to protrude downward from the cap member 15, and the lower end side of each locking portion may be caulked into each of the exhaust holes 13B, 21B. In this case, the cap member 15 does not necessarily need to be provided with the cylindrical portion 15C.

[Effect of idea]

As detailed above, according to the present invention, a radial exhaust hole is formed in the cylindrical member fixed to the bump rubber receiver, and the cap member fixed to the lower surface of the bump rubber receiver is fitted onto the outer circumferential side of the cylindrical member. In addition, a part of the lower end side is used as a locking part, and the locking part is bent inward in the radial direction toward the exhaust hole of the cylindrical member, so that it can be locked, for example, during the final assembly process. By simply bending the locking portion and locking it in the exhaust hole, the cap member and the bump rubber receiver can be easily fixed to the cylindrical member, and not only can the cap member be securely prevented from coming off, but also workability can be improved. Further, the cylindrical member can be easily formed by press-forming exhaust holes and the like on a single metal plate and then roll-forming, and has various effects.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, and FIG. 1 is an external view of a broken main part of a hydraulic shock absorber;
Figure 2 is a perspective view of the cylindrical member shown in Figure 1;
The figures are a perspective view of the cap member shown in Fig. 1, and a perspective view of the cap member shown in Fig. 4.
The figure is a perspective view of a cylindrical member showing a second embodiment. 1... Outer cylinder, 3... Packing cap, 5...
Piston rod, 11...Bump rubber, 13,
21... Cylindrical member, 13B, 21B... Exhaust hole,
14...Bump plate (bump rubber holder),
15... Cap member, 15B... Lid part, 15C
...Cylindrical part, 15D...Slit, 15E...Locking part.

Claims (1)

[Scope of utility model registration request] A shock absorber main body, a packing cap that covers the upper end of the shock absorber main body, a piston rod whose one end protrudes outside the shock absorber main body via the packing cap, and a bump provided on the protruding end side of the piston rod. In the hydraulic shock absorber, the shock absorber includes a cylindrical member that is fixed to the packing cap so as to surround the piston rod and has an exhaust hole formed in the radial direction, and a bump rubber that receives the bump rubber when the piston rod is at its maximum contraction. A bump rubber receiver is fixed to the lower surface of the bump rubber receiver in order to fix the bump rubber receiver to the cylindrical member, and is fitted onto the outer circumferential side of the cylindrical member, with a portion of the lower end extending in the radial direction. a cap member that is bent inward and serves as a locking portion that locks into the exhaust hole of the cylindrical member;
A hydraulic shock absorber characterized by being provided with.